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Coquandite

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Formula:
Sb6+xO8+x(SO4)(OH)x(H2O)1- x (x = 0.3)
Originally assumed to be (SbO)6(SO4)O2.H2O.
System:
Triclinic
Hardness:
3 - 4
This page provides mineralogical data about Coquandite.

Classification of Coquandite

Approved 1991
7.DE.35

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
E : With only medium-sized cations; unclassified
30.1.18.1

30 : ANHYDROUS SULFATES CONTAINING HYDROXYL OR HALOGEN
1 : (AB)m(XO4)pZq, where m:p>2:1
25.8.2

25 : Sulphates
8 : Sulphates of Sb, V, Cr and U
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First Recorded Occurrence of Coquandite

Year of Discovery:
1991

Physical Properties of Coquandite

Hardness (Mohs):
3 - 4

Crystallography of Coquandite

Crystal System:
Triclinic
Cell Parameters:
a = 11.43Å, b = 29.77Å, c = 11.31Å
α = 91.07°, β = 119.24°, γ = 92.82°
Ratio:
a:b:c = 0.384 : 1 : 0.38

Optical Data of Coquandite

Type:
Biaxial (+)
Dispersion:
r < v strong

Chemical Properties of Coquandite

Formula:
Sb6+xO8+x(SO4)(OH)x(H2O)1- x (x = 0.3)

Originally assumed to be (SbO)6(SO4)O2.H2O.
Essential elements:
All elements listed in formula:

Relationship of Coquandite to other Species

7.DE.05MangazeiteAl2(SO4)(OH)4 · 3H2O
7.DE.10CarbonatecyanotrichiteCu4Al2(CO3,SO4)(OH)12 · 2H2O
7.DE.10CyanotrichiteCu4Al2(SO4)(OH)12 · 2H2O
7.DE.10UKI-1975-(SO:AlCu)(Cu, Al, SO4, H2O)
7.DE.15SchwertmanniteFe163+(OH,SO4)12-13O16 · 10-12H2O
7.DE.20TlalociteCu10Zn6(Te6+O4)2(Te4+O3)(OH)25Cl · 27H2O
7.DE.25UtahiteCu5Zn3(TeO4)4(OH)8 · 7H2O
7.DE.40OsakaiteZn4(SO4)(OH)6 · 5H2O
7.DE.45WilcoxiteMgAl(SO4)2F · 17H2O
7.DE.50Stanleyite(V4+O)(SO4) · 6H2O
7.DE.55McalpineiteCu3(Te6+O6)
7.DE.60HydrobasaluminiteAl4(SO4)(OH)10 · 12-36H2O
7.DE.62VolaschioiteFe4(SO4)O2(OH)6 · 2H2O
7.DE.65ZaheriteAl12(SO4)5(OH)26 · 20H2O
7.DE.70LautenthalitePbCu4(SO4)2(OH)6 · 3H2O
7.DE.75CamerolaiteCu4Al2(HSbO4,SO4)(CO3)(OH)10 · 2H2O
25.8.1Klebelsbergite(SbO)4(SO4)(OH)2
25.8.3PeretaiteCa(SbO)4(SO4)2(OH)2 · 2H2O
25.8.4CannoniteBi2(SO4)O(OH)2
25.8.5Minasragrite(V4+O)(SO4) · 5H2O
25.8.6Stanleyite(V4+O)(SO4) · 6H2O
25.8.7Redingtonite(Fe2+,Mg,Ni)(Cr,Al)2(SO4)4·22H2O
25.8.8Metauranopilite(UO2)6(SO4)(OH)10 · 5H2O
25.8.9Uranopilite(UO2)6(SO4)O2(OH)6 · 14H2O
25.8.10NatrozippeiteNa5(UO2)8(SO4)4O5(OH)3 · 12H2O
25.8.11ZippeiteK3(UO2)4(SO4)2O3(OH) · 3H2O
25.8.12JohanniteCu(UO2)2(SO4)2(OH)2 · 8H2O
25.8.13MagnesiozippeiteMg(UO2)2(SO4)O2 · 3.5H2O
25.8.14ZinczippeiteZn(UO2)2(SO4)O2 · 3.5H2O

Other Names for Coquandite

Name in Other Languages:
German:Coquandit
Spanish:Coquandita

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Coquandite

Reference List:
New Minerals (1997), New Minerals 1990-1994.

Mineralogical Magazine: 56: 599-603.

Bindi, L., Biagioni, C., Ceccantini, L., Batoni, M. & Menchetti, S. (2014): Coquandite, Sb6+xO8+x(SO4)(OH)x(H2O)1-x (x = 0.3) from the Cetine mine, Tuscany, Italy: crystal structure and revision of the chemical formula. Mineralogical Magazine (in press).

Internet Links for Coquandite

Localities for Coquandite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Italy
 
  • Tuscany
    • Grosseto Province
      • Scansano
        • Pereta
Min.Mag.:56:599-603.
    • Pisa Province
      • Pomarance
Orlandi, P. (1997): Zibaldone di mineralogia italiana. Rivista Mineralogica Italiana, 21, 179-185. ; Bardi, T., Biagioni, C., & Orlandi, P. (2009). Aggiornamento sui minerali della Sorgente Solfurea di Micciano (Pomarance, Pisa, Toscana). MICRO (località), 1/2009, 261-276.
    • Siena Province
      • Chiusdino
Lapis Magazine Vol 6.1993 Page 22
Japan
 
  • Shikoku Island
    • Ehime Prefecture
      • Saijo City
specimens seen at Kyoto show, 2010
Luxembourg
 
  • Goesdorf commune
    • Goesdorf
Simon Philippo analysis (to be published); [Filella M., Philippo S., Belzile N., Chen Y. and Quentel F. (2009) Natural attenuation processes applying to antimony: A study in the abandoned antimony mine in Goesdorf, Luxembourg - Science of the total environment (in press)]
Portugal
 
  • Porto District
    • Gondomar
      • Medas
Romania
 
  • Maramureș Co.
Gabor Koller specimens
USA
 
  • Washington
    • Okanogan Co.
      • Tonasket
        • Whitestone Coulee
Min.Mag.: 56:599-603.
Mineral and/or Locality  
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